Bandwidth for High Speed Networks

We used a similar script in our simulation with the

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Unformatted text preview: or ows15to send at signi cantly more than the current fair share. In addition, such 13 We are grateful to Sally Floyd who provided us her script implementing the REDI algorithm. We used a similar script in our simulation, with the understanding that this is a preliminary design of the identi cation algorithm. Our contention is that the design of such an identi cation algorithm is fundamentally di cult due to the uncertainty of RTT. 14 Approximations to complete drop-tolerance can be reached in video transport using certain coding schemes or le transport using selective acknowledgements. 15 These re-hose coding and le transfer methods also have some re-hoses decrease the bandwidth available to other ows because packets destined to be dropped at a congested link represent an unnecessary load on upstream links. With universal deployment of the allocation approach, every other ow would still obtain their fair share at each link, but that share may be smaller than it would have been if the re-hose had been using responsive end-to-end congestion control. It is impossible to know now whether this will become a serious problem. Certainly, though, the problem of re-hoses in a world with fair bandwidth allocation is far less dire than the problem of unfriendly ows in our current FIFO Internet, since the incentive to be unfriendly and the harmful impact on others are considerably greater in the latter case. As a consequence, our paper emphasizes the problem of unfriendly ows in our current FIFO Internet, and is less concerned with re-hose ows in an Internet with fair bandwidth allocation. Nonetheless, the re-hose problem should not be ignored; ows should be given an incentive to adopt responsive endto-end congestion. One possible method is to explicitly punish unresponsive ows by denying them their fair share.16 Punishment is discussed as one possible bandwidth management approach in 8 the approach described there is informally referred to as RED-with-a-penalty-box. Accurately identifying ows as unresponsive may be far easier than identifying them as unfriendly. However, as we saw in our simulations, doing so in the conte...
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This document was uploaded on 03/04/2014 for the course ENG 531 at Rice.

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